Estudio de la formación del disco de satélites de la vía láctea (DoS) como un grupo de progenitores que entra al halo de la galaxia

Se estudia un posible escenario de formación para el disco de satélites de la vía láctea a partir de la caída de una asociación de enanas perteneciente al grupo local que por sus características dinámicas, estructurales y observacionales podría ser considerada como un posible progenitor de algunas de las galaxias del sistema de satélites de la vía láctea. La evolución dinámica del posible progenitor se evalúa a través de los tiempos de fricción dinámica asociados a las agrupaciones del filamento 14 y a partir de estos se verifica la plausibilidad de la asociación como progenitor del sistema de satélites.Abstract. We study a Disc of Satellites formation scenario through the interaction of an association of dwarf galaxies belonging to the local group that can be considered due to its dynamical, structural and observational properties as a progenitor of the milky way galaxy satellites. The dynamic evolution associated to this progenitor is evaluated using the dynamical friction time for the associations of the filament 14 and from this results can be verified the physical status of this association as a progenitor of the Milky Way satellite system.Maestrí

An Optically Targeted Search for Gravitational Waves emitted by Core-Collapse Supernovae during the Third Observing Run of Advanced LIGO and Advanced Virgo

We present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed optically within 30 Mpc during the third observing run of Advanced LIGO and Advanced Virgo. No gravitational wave associated with a core-collapse supernova has been identified. We then report the detection efficiency for a variety of possible gravitational-wave emissions. For neutrino-driven explosions, the distance at which we reach 50% detection efficiency is up to 8.9 kpc, while more energetic magnetorotationally-driven explosions are detectable at larger distances. The distance reaches for selected models of the black hole formation, and quantum chromodynamics phase transition are also provided. We then constrain the core-collapse supernova engine across a wide frequency range from 50 Hz to 2 kHz. The upper limits on gravitational-wave energy and luminosity emission are at low frequencies down to 10−4M⊙c2 and 5×10−4M⊙c2/s, respectively. The upper limits on the proto-neutron star ellipticity are down to 5 at high frequencies. Finally, by combining the results obtained with the data from the first and second observing runs of LIGO and Virgo, we improve the constraints of the parameter spaces of the extreme emission models. Specifically, the proto-neutron star ellipticities for the long-lasting bar mode model are down to 1 for long emission (1 s) at high frequency

Geometría de estructuras de Dirac y sistemas con ligaduras

El objetivo de esta tesis es explorar las bases de la dinámica con ligaduras a través de las variedades de Dirac H-torcidas, esta estructura geométrica introducida por Pavol Severa y Alan Weinstein (1999) corresponde a una variedad de Dirac (en el sentido de Courant y Weinstein) sobre la cual se introduce una 3-forma diferencial cerrada denominada torcimiento que aporta un conjunto de propiedades discrepantes a la hora de ampliar el contenido geométrico definido por una variedad de Dirac. A lo largo del texto privilegiamos el punto de vista geométrico a través de las estructuras de Dirac H-torcidas y resaltamos su importancia con el propósito de entender y reconstruir las leyes físicas asociadas a la dinámica ligadaThe aim of this thesis is to explore the nature of the constraint dynamics using twisted Dirac manifolds, thos geometric structure introduced by Pavol Severa and Alan Weinstein (1999) corresponds to a Dirac differential manifold and a 3-form defined on it, called twisting. Using this 3-form we construct a series of examples of dynamical systems that model the geometry of Dirac structuresMagíster en MatemáticasMaestrí

A search for distinctive footprints of compact binary coalescence within alternatives theories of gravity

We implement a theoretical analysis of the amplitude intensity associated to tensorial and non-tensorial polarization modes generated by binary systems at their inspiral stage, within the alternative theories of gravity of Brans Dicke, Rosen, and Lightman Lee. This study is performed without making an explicit use of the Transverse Traceless gauge of the General Relativity approach, and at the Newtonian limit. Consequently such supplementary sectors (non-tensorial) appear due to additional degrees of freedom in modified theories of gravitation. We model and compare the different polarization modes and strain signals for each scheme varying the sky location. Thus offering a framework to confront the physical behavior of the signal, which in turn allows us to identify the locations where these modes are more intense and therefore susceptible to being detected.Comment: 24 pages, 7 figure

An Optically Targeted Search for Gravitational Waves emitted by Core-Collapse Supernovae during the Third Observing Run of Advanced LIGO and Advanced Virgo

International audienceWe present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed optically within 30 Mpc during the third observing run of Advanced LIGO and Advanced Virgo. No gravitational wave associated with a core-collapse supernova has been identified. We then report the detection efficiency for a variety of possible gravitational-wave emissions. For neutrino-driven explosions, the distance at which we reach 50% detection efficiency is up to 8.9 kpc, while more energetic magnetorotationally-driven explosions are detectable at larger distances. The distance reaches for selected models of the black hole formation, and quantum chromodynamics phase transition are also provided. We then constrain the core-collapse supernova engine across a wide frequency range from 50 Hz to 2 kHz. The upper limits on gravitational-wave energy and luminosity emission are at low frequencies down to $10^{-4}\,M_\odot c^2$ and $5 \times 10^{-4}\,M_\odot c^2$/s, respectively. The upper limits on the proto-neutron star ellipticity are down to 5 at high frequencies. Finally, by combining the results obtained with the data from the first and second observing runs of LIGO and Virgo, we improve the constraints of the parameter spaces of the extreme emission models. Specifically, the proto-neutron star ellipticities for the long-lasting bar mode model are down to 1 for long emission (1 s) at high frequency